The first lady later reported Fonda to the Secret Service, her communications director, Stephanie Grisham, confirmed to PEOPLE.

Roseanne learned about the line you can not cross with the Hollywood elite...a line TV writer Pat Dussault and actor Peter Fonda appear to have NOT violated yet, despite their threatening language towards President Trump and his family.

"I tweeted something highly inappropriate and vulgar about the president and his family in response to the devastating images I was seeing on television", he said in a statement.

But he also added that, like every other American, concerned about the situation of children separated from their families on the US border.

People have been railing against the Trump administration policy of separating immigrant families arriving at the U.S. -Mexico border without documentation. It was wrong and I should not have done it.

The since-deleted tweet from Dussault has been captured by screen grabs and the Secret Service have reportedly been informed of the post, Yahoo!

Deadline notes that Sony Pictures Classics called Fonda's tweets "abhorrent", but noted he only has a "minor" part in their upcoming movie Boundaries, so it won't pull the film - something DonaldTrump Jr. Both first lady Melania Trump and Donald Trump Jr. have rebuked Fonda, the brother of Jane Fonda and son of Hollywood legend Henry Fonda.

'I immediately regretted it and sincerely apologise to the family for what I said and any hurt my words have caused'.

A spokesman for Sony Pictures Classics, referring to the indie feature Boundaries which is set to open Friday, said: "Peter Fonda's comments are abhorrent, reckless and unsafe, and we condemn them completely". Fonda's role in the film is small, AP reports. Such a change would penalize everyone who worked on the film, the company said. "We plan to open the film as scheduled this weekend, in a limited release of five theatres".